Young clubman Bob Gilmore is called by telephone to his home, where his parents are giving him a birthday party. He overhears one of the male guests make a slurring remark about his mother's appearance, and punishes him right there, throwing the entire gathering into an uproar. Later in the evening he assumes guilt for a check which had actually forged by his foster father, in order to save the mother's feelings, but obtains a written confession from the guilty man for future use if necessary. Learning that he had been adopted from a foundling asylum in infancy, Bob decides to go to New York to see if he cannot learn his real name, which he understands begins with "Mor." He disguises himself and enters many homes, attired in evening clothes, and is soon known to the police as "The Midnight Man." In the meantime he has come into contact with members of the White Circle gang, and has many close physical encounters with them.—Moving Picture World, August 23, 1919